Hi,
using the USB Loader - I experience the problem with some games that crash down because my 2,5'' Samsung HDD (160GB) seems to shut down (sleep mode?) when the Wii is not loading new data. I already checked the Samsung website, but didn't find any solution for this problem.
Is there a useful Tool to set a different sleep time for my HDD?

Yes, 2,5'' - only powered by the Wii USB.
Tried both ways - using just one or two USB connectors. Both ways work fine - after 40-60 minutes of playing the HDD shuts down.
The HDD is listed as working in the wiki.gbatemp compatibility list (Samsung 160GB 2,5'') ...